can someone please briefly explain this whole positive and negative charge thing to me. I kind of get it, but the informations is just not clarified in my head. I think that the elements which form ions with a negative charge are located in the nonmetals column?

Where are the non-metals?

They are on the right upperside of the periodic table.

Where are the metalloids?

They are along the step like line between metals and nonmetals of the periodic table.